How to recognize woolly beech aphid 

Woolly beech aphid is a mediumsized (2-3 mm) elongated, yellow green aphid. Adults are covered with a water repellent waxy coating, which younger stages lack. They are sometimes misidentified for mealybugs, because of their woolly appearance. The antennae are shorter than the body. Winged stages have a wax-covered abdomen. The aphid overwinters as an egg on young beech tree twigs. 

Wooly beech aphid Phyllaphis fagi
Wooly beech aphid
Woolly beech aphid
Woolly beech aphid close-up

Woolly beech aphid damage and distribution 

Woolly beech aphids prefer the underside of young beech tree leaves. Their feeding causes leaf curling and yellow spots on the upper side of the leaves. Young shoot development is decreased and heavy infestation on young plants can even cause plant death. The aphids are often found in young tree plantings. Woolly beech aphids produce large amounts of honeydew, which acts as a growth medium for black sooty mold fungus, which in turn hampers photosynthesis. 

Woolly beech aphid life cycle

  • overwinters as egg
  • fundatrices hatch in spring
  • several generations during summer
  • males occur during fall
  • females lay 6-10 eggs after mating

Woolly beech aphid host plants

  • exclusive to beech (Fagus)
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Woolly beech aphid

EXOCHOMUS QUADRIPUSTULATUS against pulvinaria scale


Effective against
– Several soft scales
– Several (woolly) aphids


Effective against
– Many different aphid species

Common aphid species

Potato aphid
Maple aphid
Foxglove aphid
Cotton aphid
Oleander aphid
Lime aphid
Green peach aphid
Woolly apple aphid

Mottled arum aphid
Yellow rose aphid
Woolly beech aphid